Short answer: In most cases, a retention period is needed to maintain the width gained after palatal expansion. The expander is usually left in the mouth for a while after active expansion ends; the width is maintained while new bone tissue forms. If retention is insufficient, relapse can occur. The duration and the next stage are determined through check-ups with the orthodontist.
The period after palatal expansion is often the least discussed stage of treatment, yet it is the most important for preserving the result. Although the appliance may seem to have done its job once the expansion screw has been turned, the newly gained width needs time, and usually a retention period, to settle. In this article, we explain in general terms what happens after expansion, why retention is needed and how the gap between the front teeth should be interpreted. For an overview of appliance types, you can also take a look at our orthodontic appliances page.
What happens after palatal expansion is finished?
Once expansion is complete, the screw is no longer turned, but in most cases the appliance is left in the mouth for a while longer. At this stage, the appliance does not actively expand; it works like a passive retainer that holds the position achieved. The aim is to give new bone tissue time to form and settle in the opened palatal suture.
The orthodontist carries out regular check-ups during this period. At check-ups, the condition of the palatal area, how the upper and lower teeth fit together, hygiene and the fit of the appliance are evaluated. When the expander will be removed is planned according to the specifics of the case and the age of the child or teenager; this decision varies from patient to patient. For the basic logic of the appliance that starts the expansion, you can read our article on the palatal expander.
Cleaning the appliance that stays in the mouth during this period is important. Food debris can build up between the palate and the appliance; the mouth should be rinsed with water after every meal, brushing should not be neglected and, when necessary, the cleaning method recommended by the orthodontist should be used. If the appliance loosens on its own, breaks or irritates the palate, you should contact the clinic without waiting.
Why does the width tend to relapse?
The expanded structure is under the influence of bone, connective tissue, gum fibers and surrounding muscles, and these tissues do not adapt to the new position immediately. New bone formation in the palatal suture takes time, and if the force is removed before this period is over, some relapse can occur due to tissue elasticity. In orthodontics, this is called relapse.
The main factors affecting the risk of relapse are:
- The amount and speed of expansion
- The patient's age and bone maturity
- Whether the retention period was applied for long enough
- The balance of the tongue and cheek muscles, and habits such as tongue thrusting or mouth breathing
- The way the lower and upper jaws fit together
For this reason, instead of removing the appliance right after expansion, retention for the period determined by the orthodontist is recommended. Because no orthodontic correction offers absolute protection against relapse, the retention plan should be tailored to the case.
In growing children, the palatal suture is more flexible, so expansion is achieved more easily, but because growth continues, follow-up is also long-term. After puberty, as the bone matures, expansion becomes more difficult; for this reason, the timing and retention plan differ according to age.
How long does the retention period last?
The retention period varies from person to person; in most cases, the expander is left in the mouth for about three to six months after active expansion ends, but this is not a strict rule. The orthodontist determines the duration by evaluating the condition of the palatal area and other clinical findings.
After the appliance is removed, if needed, a removable retention appliance, a palatal plate or another retainer may be used. In addition, if treatment continues with braces or clear aligners after expansion, the appliances used at this stage also serve a retention function. Even in children who do not have a treatment plan after expansion, monitoring check-ups continue while the permanent teeth erupt. Monitoring check-ups at short intervals after the retention period show how the teeth and jaws are adapting to the new position. As the child grows and the permanent teeth come in, the plan can be re-evaluated. For the general logic of retention, you can look at our article on the retainer.
Does the gap between the front teeth close on its own?
A gap opening between the upper front teeth during expansion is a common and, in most cases, expected finding. This gap shows that the palatal suture has opened, and it is often the reason patients come in with concerns.
After expansion ends, the gap tends to close partially or completely on its own in most children, due to the effect of gum fibers and surrounding tissues. Still, it may not close in the same time frame or to the same extent in every child. If it does not close, or if the teeth shift into an undesired position, this gap is corrected in the next stage of orthodontic treatment. For this reason, the appearance of the gap in the first weeks does not mean that treatment is failing or going wrong; on the contrary, it is a sign suggesting that expansion is progressing in the intended direction. Still, the size of the gap and how quickly it closes should be monitored by the orthodontist. Rather than worrying about the gap, it is better to follow up with the orthodontist at check-up appointments. Families should not do anything on their own to try to close the gap.
Are braces or clear aligners needed after expansion?
In most cases, yes; expansion is a first step that prepares the teeth and jaws to fit together, and a second stage is usually needed to align the teeth. Expansion alone can correct a crossbite or lack of space, but braces or clear aligners are often considered to make the teeth fit together fully.
If not all permanent teeth have erupted after expansion, a short waiting and monitoring period is sometimes planned. This makes use of growth and avoids putting on braces unnecessarily early. Depending on the case, this transition takes place either right away or after waiting for the permanent teeth to erupt. For adult and teenage patients, orthodontic treatment with Invisalign can be considered for the tooth alignment stage in suitable cases; the orthodontist decides whether it is appropriate. To compare the options, you can review our clear aligner treatment page. The plan for each stage is not set up independently, but as part of a comprehensive treatment plan.
How is a retention appliance used?
A retention appliance is worn for the duration and on the schedule the orthodontist specifies, usually at night or during the specified hours. A removable retainer loses its function if it is not worn regularly, because the teeth and surrounding tissues tend to return to their old positions over time.
For use and care, the following points are kept in mind:
- Wear the appliance every day for the recommended time; do not reduce wear on your own.
- Clean it after each use with a soft brush and lukewarm water; hot water can distort the plastic.
- Store it in its own case when you are not using it; do not wrap it in a napkin.
- If the appliance does not fit, or if it is cracked or broken, contact the clinic immediately.
If the appliance is lost or starts to feel tight, you should not delay, because the teeth can shift even within a short time.
The most common mistake families make during the retention period is skipping check-ups because there is visible improvement. Yet whether the width is being maintained often cannot be seen with the naked eye; it is evaluated with measurements, examination and, when necessary, imaging. For this reason, continuing with appointments is important for the stability of the results.
For a child who has undergone expansion, it is also helpful to note changes in daily functions such as sleep patterns at night, nasal breathing and speech. When these observations are shared with the orthodontist, follow-up can be guided more accurately. Even if there are no complaints, having a general orthodontic and dental check-up at least once a year is a good habit.
Check-ups and follow-up in Ankara
Check-ups during the retention period are critically important for understanding whether the width is being maintained and whether the right time has come for the next treatment. At our clinic in Park Oran, Çankaya, follow-up and the retention plan after expansion are determined through examination; treatment and fee information is provided in writing after examination and planning. You can use our contact page to make an appointment.
Frequently asked questions
Does palatal expansion relapse?
If the retention period is not applied for long enough, part of the width may relapse; this is called relapse. Adequate retention and regular check-ups reduce this risk. The risk of relapse is never completely eliminated in any orthodontic correction.
How long does the expander stay in the mouth?
After expansion is complete, in most cases the appliance is left in the mouth for about three to six months for retention. The duration varies from person to person. The orthodontist determines the exact duration.
Does the gap between the front teeth close after expansion?
In most children, this gap tends to close partially or completely over time. It may not happen at the same speed in every child. A gap that does not close is corrected in the next orthodontic stage.
Are braces a must after palatal expansion?
In most cases, a second stage is needed to align the teeth; this can be braces or, in suitable cases, clear aligners. For some children, monitoring may be enough. The decision is made through examination.
What happens if I forget to wear my retention appliance?
Skipping one or two days usually does not cause a big problem, but forgetting regularly can cause the teeth and the width to shift back. If the appliance feels tight or does not fit, you should see your orthodontist.
